I just Got the Alien Quadrilogy. I like 3 & 4, Just as I like terminator 3, But watch the bonus discs for Alien 3 & 4, and watch the featuretts about the pre-production. Basically, they almost come out and say they were mistakes. Flat-out. They also start referring it as a franchise, and not a movie or story, and at that point is when you start makeing a movie just for the sake of making one. Which in some cases is okay, they can make as many Austin powers as they want because the whole movie is about gags, but once you start cloning characters it can make you want to puke almost. The story and the characters will lose their meaning. When you have a death in a story it is significant because you lost that character, but when they start bringing them back from cloning, or "that was my twin brother" unless it has some validity, that is when the audience goes sour.